Patent WO-2019239167-A1 (WO)
Title: Filtering equipment and method for the cleaning of water-based liquids with diatomaceous earth micro-filtration
Inventor: DÓKA GÁBOR
IPC: C12H1/02
Filed: 2018-07-24
Abstract: The present invention relates to a filtering equipment for the cleaning of water-based liquids with diatomaceous earth micro-filtration, which contains a filter body (20) suitable for accommodating and supporting a microfiltration layer (30), a base body (10) having a receipt space (1 1) and a housing (1) suitable for accommodating the base body (10) and the filter body (20), the filter body (20) has a feed aperture (21) located on the input side (31) of the microfiltration layer (30) and connected to the microfiltration layer (30) so as to permit the flow of liquid, which is bordered by the internal covering surface (22) of the filter body (20) and is suitable for receiving the water-based liquid to be filtered (2), while the base body (10) has at least one outlet passage (12) serving for discharging the filtered water-based liquid (3), the internal delimiting surface (13) of the base body (10) and the external surface (23) of the filter body (10) are separated by a gap (T), and in the gap (T) there is a discharge space part (ET) serving for transporting the filtered water-based liquid (3), the feed aperture (21) of the filter body (20) is connected to an intake passage (4) suitable for transporting the liquid to be filtered (2) into the feed aperture (21), while the intake passage (4) is connected to a supply pipe (5), the equipment has at least one pressure sensor body (41) connected to the supply pipe (5) and/or to the intake passage (4) and/or to the feed aperture (21), where the pressure sensor body (41) has a connection with a control unit (40) suitable for transmitting information, and the control unit (40) is connected to a regulation body (42) that influences the introduction of the water-based liquid to be filtered (2) into the intake passage (4). The characteristic feature of the invention is that the microfiltration layer (30) of the filter body (20) consists of a mixture of solid grains containing 50-95% diatomaceous earth and 5-50% cellulose and 5-50% pearlite and/or 5-50% zeolite and/or 5-50% activated carbon and/or 1-5% Si02 with respect to total solids. The invention also related to a method for the cleaning of water-based liquids with diatomaceous earth micro-filtration, during which a liquid containing diatomaceous earth is made to flow through the filter body (20) of the filtering equipment from the direction corresponding to the flow direction of the water-based liquid to be filtered (2), and a microfiltration layer (30) is created on this surface of the filter body (20), following this the water-based liquid to be filtered (2) is passed through the created microfiltration layer (30), and the filtered water-based liquid (3) is created in this way. The characteristic feature of the method is that in order to produce the microfiltration layer (30) of the filter body (20) solid grains containing 50-95% diatomaceous earth and 5- 50% cellulose and 5-50% pearlite and/or 5-50% zeolite and/or 5-50% activated carbon and/or 1-5% Si02 with respect to total solids are mixed together, and using the liquid this mixture is transported to the filter body (20), after the microfiltration layer (30) has been established the water-based liquid to be filtered (2) is made to flow through the microfiltration layer (30) of the filter body (20) while in the mean time the filtration resistance of the filter equipment is measured, and the filtration process is continued until the filtration resistance increases to 5 bar, when a filtration resistance level of 5 bar is achieved the supply of the water-based liquid to be filtered is interrupted, the water-based liquid to be filtered (2) is forced out of the receipt space (1 1) of the base body (10) suitable for accommodating the filter body (20) by blowing in a gaseous medium, the used microfiltration layer (30) is removed from the filter body (20), and the filtration is continued with the construction of a new microfiltration layer (30).